Qt Creator CMake port

Based on Tobias Hunger's work from a few months ago.

The CMake configuration needs libclang and Qt paths specified as
CMAKE_PREFIX_PATH.

Auto tests are run with "ctest". At the moment the pass rate is 87%.

Change-Id: Iba98e39bf22077d52706dce6c85986be67a6eab0
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/libs/cplusplus/CMakeLists.txt

@@ -0,0 +1,44 @@
+# TODO: Support static build, currently being done with CPLUSPLUS_BUILD_STATIC_LIB
+#       -- if really needed that is.
+# TODO: Make Qt5::Gui optional -- if really needed that is.
+
+add_qtc_library(CPlusPlus
+  DEPENDS Utils
+  DEFINES CPLUSPLUS_BUILD_LIB
+  PUBLIC_DEPENDS 3rd_cplusplus Qt5::Concurrent Qt5::Gui
+  PUBLIC_INCLUDES "${CMAKE_SOURCE_DIR}/src/libs/3rdparty"
+  SOURCES
+    ASTParent.cpp ASTParent.h
+    ASTPath.cpp ASTPath.h
+    AlreadyConsideredClassContainer.h
+    BackwardsScanner.cpp BackwardsScanner.h
+    CppDocument.cpp CppDocument.h
+    CppRewriter.cpp CppRewriter.h
+    DependencyTable.cpp DependencyTable.h
+    DeprecatedGenTemplateInstance.cpp DeprecatedGenTemplateInstance.h
+    ExpressionUnderCursor.cpp ExpressionUnderCursor.h
+    FastPreprocessor.cpp FastPreprocessor.h
+    FindUsages.cpp FindUsages.h
+    Icons.cpp Icons.h
+    LookupContext.cpp LookupContext.h
+    LookupItem.cpp LookupItem.h
+    Macro.cpp Macro.h
+    MatchingText.cpp MatchingText.h
+    NamePrettyPrinter.cpp NamePrettyPrinter.h
+    Overview.cpp Overview.h
+    PPToken.cpp PPToken.h
+    PreprocessorClient.cpp PreprocessorClient.h
+    PreprocessorEnvironment.cpp PreprocessorEnvironment.h
+    ResolveExpression.cpp ResolveExpression.h
+    SimpleLexer.cpp SimpleLexer.h
+    SnapshotSymbolVisitor.cpp SnapshotSymbolVisitor.h
+    SymbolNameVisitor.cpp SymbolNameVisitor.h
+    TypeOfExpression.cpp TypeOfExpression.h
+    TypePrettyPrinter.cpp TypePrettyPrinter.h
+    cppmodelmanagerbase.cpp cppmodelmanagerbase.h
+    findcdbbreakpoint.cpp findcdbbreakpoint.h
+    pp-cctype.h pp-engine.cpp
+    pp-engine.h pp-scanner.cpp
+    pp-scanner.h
+    pp.h
+)